Cannot Add Windows Server 2012 as Member Server to Existing Domain

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http://serverfault.com – We have an existing Windows Server 2003 domain and several other computers are on that network (i.e., we have Windows Server 2008 member servers, other Windows Server 2003 member servers, Windows 7 and XP workstations, and even a Windows 2000 Server member server). Everything has been working fine until this first Windows Server 2012 server. We need to add this Windows Server 2012 server as a member server to our exist domain. We do not want it to be a domain controller, not even a backup domain controller - just another server on the network. When we try to add it to the domain using the (HowTos)